What Is an HS Code?
HS codes are the international classification system for traded goods. Getting them wrong can mean paying the wrong duty rate — or a customs delay.
Key Takeaways
- HS codes are the international standardised system for classifying traded goods.
- The first six digits are universal; additional digits are country-specific.
- The correct HS code determines your duty rate — misclassification is a compliance risk.
What HS codes are
The Harmonised System (HS) is an internationally standardised nomenclature for classifying traded goods, maintained by the World Customs Organisation. Every physical product that crosses a border is assigned an HS code. The first six digits are the same worldwide; importing countries add further digits (the UK uses 10-digit commodity codes).
How they're structured
HS codes are hierarchical. The first two digits indicate the chapter (e.g., chapter 61 covers knitted or crocheted clothing). The next two indicate the heading (6109 = T-shirts, singlets, and similar garments). The next two are the subheading. UK commodity codes add four more digits for UK-specific tariff purposes.
Why they matter
Your HS code determines your import duty rate, whether goods are subject to anti-dumping duties, whether certain licences are needed, and which FTA preferences apply. Using the wrong code — deliberately or accidentally — is a compliance risk that can result in underpaid or overpaid duty, delays, and penalties.
How to find the right code
The UK Trade Tariff (gov.uk/trade-tariff) allows you to search by product description. For complex or borderline products, a freight forwarder or customs broker can provide a formal classification. For common product categories, AskBiz's Landed Cost Calculator includes HS code guidance built in.